Thanks, happy to hear you're enjoying the game :)
Re: scenarios, tbh my hope was that people would create new scenarios (like a lot of other features in the game, they're moddable) and share them, however this (or at least the sharing part) hasn't happened. Well, not yet, at least.
It's possible I might add new scenarios in the future, but I can't really tell you when it would happen. Do you have any suggestions? What would you like to see? (I'm not promising anything, but at least it might give me a starting point)